How is possible that lines inside meshes?

Questions
, ,
1

spotlight ->

                            _spotLight.position.set( 100, 1000, 100 ); 
			_spotLight.castShadow = true; 
			_spotLight.shadow.mapSize.width = 1024;
			_spotLight.shadow.mapSize.height = 1024; 
			_spotLight.shadow.camera.near = 500;
			_spotLight.shadow.camera.far = 4000;
			_spotLight.shadow.camera.fov = 30; 
                            ....
                           .....

                            var scene = new THREE.Scene();
			var camera = new THREE.PerspectiveCamera( 75, w_width / w_height, 0.1, 1000 );

			var renderer = new THREE.WebGLRenderer({canvas:w_wgl});
			renderer.shadowMap.enabled = true;
			renderer.shadowMap.type = THREE.PCFSoftShadowMap; // default THREE.PCFShadowMap
			renderer.setSize(w_width,w_height);
			renderer.setPixelRatio(window.devicePixelRatio);


			scene.add( _spotLight );

                            ....
                           .....

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2

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3

sorry, it was solved using shadow props -> some objets castShadow, other receiveShadow

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